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From: Andrew Schulman <schulman DOT andrew AT epa DOT gov>
Subject: Re: [ANNOUNCEMENT] mesa 11.0.9-2 [GOLDSTAR]
Date: Fri, 10 Jun 2016 10:09:16 -0400
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> On 6/6/2016 9:27 AM, Jon Turney wrote:
> > On 06/06/2016 08:24, Yaakov Selkowitz wrote:
> >> On 2016-06-03 12:56, Jon Turney wrote:
> >>> On 31/05/2016 18:03, Jon Turney wrote:
> >>>>> # gdb ./quad-clip
> >>>>> [...]
> >>>>> (gdb) r
> >>>>> [...]
> >>>>> Program received signal SIGSEGV, Segmentation fault.
> >>>>> 0x7fdf00c1 in ?? ()
> >>> [...]
> >>>>> /usr/src/debug/mesa-demos-8.3.0-1/src/trivial/quad-clip.c:137
> >>>>> (gdb) disassemble 0x7fdf00b1,0x7fdf00d2
> >>>>> Dump of assembler code from 0x7fdf00b1 to 0x7fdf00d2:
> >>>>>    0x7fdf00b1:  insertps $0x10,0x4(%eax,%edi,1),%xmm0
> >>>>>    0x7fdf00b9:  insertps $0x20,0x8(%eax,%edi,1),%xmm0
> >>>>> => 0x7fdf00c1:  insertps $0x30,0xfffeff34,%xmm0
> >>>>>    0x7fdf00cb:  mov    (%esi),%eax
> >>>>>    0x7fdf00cd:  mul    %ecx
> >>>
> >>> After staring this a bit more, I see that this is the offset to the data
> >>> to load, apparently being used as an absolute address
> >>>
> >>> This seems to be the case with other addresses in the JIT-ed code,  so
> >>> perhaps there is some problem preventing relocations being applied...
> >>
> >> FWIW, I tried rebuilding with llvm 3.8.0.  32-bit doesn't crash anymore,
> >> and glxgears says its running, but only the background shows.
> >
> > Thanks, that was next on my list to try
> >
> > That sounds exactly like what I see with llvm svn r251761 [1] backported
> > to 3.7.1 (without which we use the x86_64 loader on x86, rather than
> > reporting an error, due to an interesting use of __builtin_undefined,
> > with hilarious consequences)
> >
> > I guess the output of the JIT code is ending up the wrong place as well,
> > or something...
> 
> For the record, Jon seems to have tracked this down, and his fix is in 
> llvm-3.7.1-2.  I can only imagine what "fun" he had debugging this, 
> particularly on the address-starved 32-bit platform.
> 
> Andrew, could you please do the honours?

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